Four of five Columbia University students arrested in what authorities described as a major crackdown on drug dealing on the Ivy League campus rejected no-jail plea deals Tuesday in hopes of wiping the legal slate clean by getting drug treatment instead, reports the Associated Press. Noting the students’ previously clean records, the city Special Narcotics Prosecutor’s office said it would agree to probation if Christopher Coles, Adam Klein, Jose Stephan Perez and Michael Wymbs pleaded guilty to felony charges. But defense lawyers said their clients were drug users and would be better rehabilitated through a treatment program…